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Theodore Higgins Arsenault
University Hospitals Seidman Cancer Center
Impact of Patient Size on Cone-Beam CT Quantitative Image Quality Using Ethos Hypersight Imaging
To evaluate the impact of patient size on cone-beam CT (CBCT) image quality using iterative reconstruction approaches on the Varian Ethos HyperSight imaging system and to assess the adequacy of attenuation and scatter correction across patient sizes.
Poster Program · Therapy Physics
A Deep Learning Framework for Institution-Independent PTV Delineation In Glioblastoma Using Heterogeneous MRI Datasets
To develop a robust, institution-independent quality assurance model using heterogeneous datasets. By prioritizing generalizability over site-specific tuning, this model aims to predict and assist in the delineation of PTV contours for glioblastoma (GBM) usin...
Poster Program · Therapy Physics
A Phantom-Based Evaluation of Direct to Unit Adaptive Radiotherapy on an Adaptive Linac
Direct-to-unit (DTU) adaptive radiation therapy (ART) is an emerging workflow that reduces treatment delays for urgent radiation therapy by eliminating the need for a separate simulation scan. Despite increasing clinical adoption, standardized commissioning g...
Poster Program · Therapy Physics
A Synthetic-Geometry, Mlc-Aware Machine Learning Framework for Collimator Angle Selection In Single-Isocenter Multi-Target VMAT SRS
Collimator orientation in single-isocenter multi-target (SIMT) SRS significantly impacts multileaf collimator (MLC) modulation and overall plan quality. We developed a machine learning (ML) framework to identify optimal collimator angles prior to Treatment Pl...
Poster Program · Therapy Physics
Dosimetric Impact of Direct CBCT-Based Dose Calculation Using the Ethos Hypersight Imaging System
The purpose of this study was to characterize the dosimetric consequences of direct CBCT dose calculation for abdominal stereotactic adaptive radiotherapy by comparing dose distributions calculated on simulation CT (simCT) versus HyperSight CBCT (HsCBCT). Emp...
Poster Program · Therapy Physics
Improving Target Coverage In Abdominal Adaptive Radiotherapy Using Distance-Based OAR Cropping In Ethos 2.0
This study evaluates whether selective distance-based cropping of organs at risk (OARs) can improve target coverage and plan robustness for abdominal stereotactic adaptive radiation therapy using the Ethos 2.0 planning system. By reducing OAR volume and thus...
Poster Program · Therapy Physics
Log File Based Patient-Specific Quality Assurance Supplement for SRS Mapcheck on Single Isocenter Multiple Target SRS/Fsrs Treatments
SRS MapCheck has been widely used for SRS pretreatment patient-specific quality assurance (PSQA); however, it requires multiple machine deliveries due to limited array size. To improve the pretreatment PSQA efficiency for Single Isocenter Multiple Target (SIM...
Poster Program · Therapy Physics
Robust Single-Isocenter Selection for Multi-Target SRS Using Weighted Expected Dice Similarity Coefficient
This work demonstrates the use of a weighted expected Dice similarity coefficient (wDSC) for optimizing isocenter placement in single-isocenter multi-target (SIMT) LINAC-based stereotactic radiosurgery (SRS).
Poster Program · Therapy Physics